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POSIGILL in Android NDK code
 

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    <p>I have an NDK app out on market and got a native crash report about a <code>SIGILL</code> signal. (I use google breakpad to generate native crash reports.) Here are the details:</p> <ul> <li>My app is compiled for <code>armeabi-v7a</code>, <strong>with</strong> NEON support.</li> <li>It crashed on a NVIDIA Tegra 2 Processor, which is ARM-7 (Cortex-A9).</li> <li>It happens every time. (contacted the user)</li> <li>The crash address was at <code>0x399cc</code>, the signal was <code>SIGILL</code>, and it's in my code.</li> </ul> <p>Registers and disassembly:</p> <pre><code> r4 = 0x001d50f0 r5 = 0x001d50f0 r6 = 0x598e2a3c r7 = 0x00000000 r8 = 0x00000001 r9 = 0x001c22b0 r10 = 0x00000000 fp = 0x81216264 sp = 0x598e2a18 lr = 0x816399cb pc = 0x816399cc 0x000399c6 &lt;_ZN8Analyzer15setExpAvgFactorEi+22&gt;: blx 0x30508 0x000399ca &lt;_ZN8Analyzer15setExpAvgFactorEi+26&gt;: fconstd d16, #7 0x000399ce &lt;_ZN8Analyzer15setExpAvgFactorEi+30&gt;: vldr d17, [pc, #32] ; 0x399f2 &lt;_ZN8Analyzer15setExpAvgFactorEi+66&gt; </code></pre> <p>Full source and assembler available <a href="http://pastebin.com/hqgeKtSG" rel="noreferrer">here</a> (it's short, basically 2 lines of C++.)</p> <p>You can see that <code>0x399cc</code> is in the middle of the <code>fconstd</code> instruction. According to <a href="http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/CJAEFGHE.html" rel="noreferrer">arm.com</a> this instruction was added in <code>VFP-v3</code>, which should (I think) be available in any modern processor.</p> <p>What could be going on? Does the fact that the address is in the <em>middle</em> of an instruction point to a corrupt pointer somewhere? (Note that the backtrace makes perfect sense, so it's not like this function was somehow called on accident.) Or is it something else?</p>
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    1. COFWIW, an official-seeming answer from NVIDIA regarding VFPv3 support on the Tegra 2 can be found here. (Spoiler: it does, so people looking at that as the issue, as VFPv3 is marked "optional" on the Cortex-A9 series, should look further.) http://developer.nvidia.com/tegra/forum/does-tegra-2-support-vfpv3
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    2. COAs for the Google Breakpad on Android, there is an open question about that if you want some easy points :) http://stackoverflow.com/questions/9752759/using-google-breakpad-for-android-ndk
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